Island



UNITED STATES PATENT OFFICE.

EUCLID C. THAYER, 0F PROVIDENCE, RHODE ISLAND.

IBELTING FOR PULLEYS.

Specification of Letters Patent No. 26,451, dated December 13,118159.

To all 'whom 'it 'may concern.'

Be it known that I, EUCLID C. THAYER, of the city and county ofProvidence, in the State of Rhode Island and Providence Plantations,have invented a new and useful manufacture, to wit.: an Improved RoundBelting for Grooved Pulleys, which is fully described in the followingspecification, reference being had to the accompanying drawings.

A strip of leather or other material of which the belting is to be made,is prepared as represented in Fig. l by A, B, C, D, of such width andthickness as may be required, by shaving the edges or in any other modeso that its transverse section as seen at A, s, t, B, is in anelliptical form or nearly so; the more perfect the ellipse the greaterthe perfection of the belting. The material being so prepared, the beltis made by rolling and twisting the material in the following manner:Commencing at the corner Atheleather or other material is rolled fromthat cornerto the points a, b, e, or el, according as a greater or lessnumber of overlapping layers is required to make the belt of therequisite size and strength, forming at the ends A, B, a cylinder F, andas the process of rolling is continued the material is twisted so thatthe strip is rolled up spirally, the same inclination of the spiral foldbeing preserved to the end of the belt. `A belt constructed in thismanner may be made of any length by lapping and cementing additionalstrips at the end C, D, either at right angles with the length of thestrip or diagonally. As the rolling and twisting proceeds a cement isplaced upon the surfaces of the strip by which the overlying folds arefirmly secured together and the more firmly than if the material wasrolled in any other way.

I prefer to so roll the material as to leave a cylindrical space in thecenter ofthe belt by means of which greater flexibility is secured toit, but the belt may be so made that when finished it will be solid. fWhen the belt is made of leather this spiral `rolling and I twistingreatly increases :the strength` of 1 the belt for" the bers `of theleather are crossed in every direction, and furthermOre if the leatheris weak in any part the lweak points of the leather will be `overlapped`by the stronger portions and thus a moreuni` form strength obtained.

. When the belt is m use if the strain upon it should cause the fibersof the belt to givel y i way at the overlapping edge as at 71., theY lbreak being generally in a direction at right angles with the spiralfold, wouldsoon be 1l y arrested bythe Vstrenth ofthe under por``` 60tions of the belt and bythe overlapping 1 y edge. The spiral form `ofthebeltyas above l y made prevents the edges of the leatheropen-` j ingby the giving way "of the cement,and `l when, combined wit-hacylindrical space in the center of the belt imparts greater leXibilityandelasticity, at the samel time secur`` 3 ing greater strength anddurability than y any other form while the tension of thebelt on thepulleys` keeps `the twist in the belt 7o firm and taut. Y Rf y I do notclaim rolling leather or other ma!` 1S terial into round beltin formachineryand cementing the `overlapping surfaces. Q y

I claimg The manufacture of round belting by pre;` .u paring the leatheror other material `111 thegjf mode described and rolling and twistingthe same in a spiral form` with` any required y number of conical`layersinthecylinder either with or without acylindrical space* thecenter of the belt and `cementing the 1 layers in the process" ofmanufacture subi stantially as described.

Witnesses: i `JOSEPH 'LPr "AN,

HENRY EARTE.

EUoLiD THAYEE.

